Webster's English Dictionary

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quiddity

quid.di.ty \'kwid-*t-e-\ n [ML quidditas essence, lit., whatness, fr. L 
   quid what, neut. of Xquis who - more at WHO 1a: a trifling point : QUIBBLE  
   1b: CROTCHET, ECCENTRICITY  2: whatever makes something to be of the type 
   that it is : ESSENCE